JPS58132476U

JPS58132476U - cathode ray tube display device

Info

Publication number: JPS58132476U
Application number: JP2849382U
Authority: JP
Inventors: 大槻　光弘; 石渡　直樹
Original assignee: 日本電気ホームエレクトロニクス株式会社
Priority date: 1982-03-02
Filing date: 1982-03-02
Publication date: 1983-09-07
Also published as: JPS6244623Y2

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第１図は本考案の１実施例に係り、通常のテレビジョン
受像機に画像情報を映像信号に変換するデコーダを組込
んで、通常のテレビジョン放送の画像情報と適宜手段を
通じて送られてくる文字、図形等の画像情報とのいずれ
か一方を選択表示する陰極線管ディスプレイ装置の回路
図である。１４．１６・・・・・・表示画像識別信号発生手段、Ｃ
１，Ｒ１・・・・・・第１の立上り検出回路、１７・・
・・・・インバータ回路、Ｃ２，Ｒ２・・・・・・第２
の立上り検出回路、１８・・・・・・第１のゲート回路
、１９・・・・・・単安定　　　　　−マルチバイブレ
ータ、２０・・・・・・第２のゲート回路、２１・・・
・・・第３のゲート回路、２２・・・・・・第１のスイ
ッチ回路、２３・・・・・・第２のスイッチ回路。FIG. 1 shows one embodiment of the present invention, in which a decoder for converting image information into a video signal is built into a normal television receiver, and the image information of normal television broadcasting is sent through appropriate means. FIG. 2 is a circuit diagram of a cathode ray tube display device that selectively displays either text, graphics, or other image information. 14.16...Display image identification signal generation means, C
1, R1...First rising detection circuit, 17...
...Inverter circuit, C2, R2...2nd
rising detection circuit, 18...first gate circuit, 19...monostable-multivibrator, 20...second gate circuit, 21...
. . . third gate circuit, 22 . . . first switch circuit, 23 . . . second switch circuit.

Claims

[Claims for Utility Model Registration] First image information and second image information including vertical and horizontal synchronization signals are received, and the vertical and horizontal synchronization signals are separated to drive the vertical and horizontal directions of the picture tube. and a cathode ray tube display device that displays on the screen of the picture tube by selectively applying either the first image information or the second image information to a video output circuit, wherein the separation horizontal in response to a horizontal sync signal. In a display device having an AFC circuit, a signal generating means for generating a display image identification signal whose signal level is inverted in response to switching of image information to be displayed on a screen; and a signal generating means for inverting the display image identification signal given from the means an inverting circuit; a first rising edge detection circuit that extracts a rising edge of the display image identification signal applied from the signal generating means; a second rising edge detecting circuit that extracts a rising edge of the inverted signal applied from the inverting circuit; a first gate circuit that performs a logical sum on the output signal of the rising edge detection circuit and the output signal of the second rising edge detection circuit; an output pulse of the first gate circuit is used as a trigger pulse;
a monostable multivibrator whose output pulse width is preset to a predetermined time until the horizontal AFC circuit pulls in the separated horizontal synchronizing signal; and an inverted output signal of the display image identification signal and the monostable multivibrator. a second gate circuit that takes the AND of the inverted signal given from the inverting circuit and the inverted output signal of the monostable multivibrator; a first switch circuit that controls supply or cutoff of the first image information to the video output circuit according to the output output, and a first switch circuit that controls supply or cutoff of the first image information to the video output circuit; A cathode ray tube display device comprising: a second switch circuit that controls supplying or cutting off the video output circuit to the video output circuit.